1
|
Witzmann T, Ramsperger AFRM, Wieland S, Laforsch C, Kress H, Fery A, Auernhammer GK. Repulsive Interactions of Eco-corona-Covered Microplastic Particles Quantitatively Follow Modeling of Polymer Brushes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:8748-8756. [PMID: 35736564 DOI: 10.1021/acs.langmuir.1c03204] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
The environmental fate and toxicity of microplastic particles are dominated by their surface properties. In the environment, an adsorbed layer of biomolecules and natural organic matter forms the so-called eco-corona. A quantitative description of how this eco-corona changes the particles' colloidal interactions is still missing. Here, we demonstrate with colloidal probe-atomic force microscopy that eco-corona formation on microplastic particles introduces a compressible film on the surface, which changes the mechanical behavior. We measure single particle-particle interactions and find a pronounced increase of long-range repulsive interactions upon eco-corona formation. These force-separation characteristics follow the Alexander-de Gennes (AdG) polymer brush model under certain conditions. We further compare the obtained fitting parameters to known systems like polyelectrolyte multilayers and propose these as model systems for the eco-corona. Our results show that concepts of fundamental polymer physics, like the AdG model, also help in understanding more complex systems like biomolecules adsorbed to surfaces, i.e., the eco-corona.
Collapse
Affiliation(s)
- Thomas Witzmann
- Leibniz Institute of Polymer Research Dresden e.V., Institute of Physical Chemistry and Polymer Physics, Hohe Str. 6, 01069 Dresden, Germany
| | - Anja F R M Ramsperger
- Animal Ecology I and BayCEER, University of Bayreuth, 95447 Bayreuth, Germany
- Biological Physics, University of Bayreuth, 95447 Bayreuth, Germany
| | - Simon Wieland
- Animal Ecology I and BayCEER, University of Bayreuth, 95447 Bayreuth, Germany
- Biological Physics, University of Bayreuth, 95447 Bayreuth, Germany
| | - Christian Laforsch
- Animal Ecology I and BayCEER, University of Bayreuth, 95447 Bayreuth, Germany
| | - Holger Kress
- Biological Physics, University of Bayreuth, 95447 Bayreuth, Germany
| | - Andreas Fery
- Leibniz Institute of Polymer Research Dresden e.V., Institute of Physical Chemistry and Polymer Physics, Hohe Str. 6, 01069 Dresden, Germany
- Physical Chemistry of Polymeric Materials, Technische Universität Dresden, Hohe Str. 6, 01069 Dresden, Germany
| | - Günter K Auernhammer
- Leibniz Institute of Polymer Research Dresden e.V., Institute of Physical Chemistry and Polymer Physics, Hohe Str. 6, 01069 Dresden, Germany
| |
Collapse
|
2
|
Guo Y, Lou J, Cho JK, Tilton N, Chun J, Um W, Yin X, Neeves KB, Wu N. Transport of Colloidal Particles in Microscopic Porous Medium Analogues with Surface Charge Heterogeneity: Experiments and the Fundamental Role of Single-Bead Deposition. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2020; 54:13651-13660. [PMID: 33079526 DOI: 10.1021/acs.est.0c03225] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Understanding colloid transport in subsurface environments is challenging because of complex interactions among colloids, groundwater, and porous media over several length scales. Here, we report a versatile method to assemble bead-based microfluidic porous media analogues with chemical heterogeneities of different configurations. We further study the transport of colloidal particles through a family of porous media analogues that are randomly packed with oppositely charged beads with different mixing ratios. We recorded the dynamics of colloidal particle deposition at the level of single grains. From these, the maximum surface coverage (θmax = 0.051) was measured directly. The surface-blocking function and the deposition coefficient (kpore = 3.56 s-1) were obtained. Using these pore-scale parameters, the transport of colloidal particles was modeled using a one-dimensional advection-dispersion-deposition equation under the assumption of irreversible adsorption between oppositely charged beads and colloids, showing very good agreement with experimental breakthrough curves and retention profiles at the scale of the entire porous medium analogue. This work presents a new approach to fabricate chemically heterogeneous porous media in a microfluidic device that enables the direct measurement of pore-scale colloidal deposition. Compared with the conventional curve-fitting method for deposition constant, our approach allows quantitative prediction of colloidal breakthrough and retention via coupling of direct pore-scale measurements and an advection-dispersion-deposition model.
Collapse
Affiliation(s)
- Yang Guo
- Department of Chemical and Biological Engineering, Colorado School of Mines, Golden, Colorado 80401, United States
| | - Jincheng Lou
- Department of Mechanical Engineering, Colorado School of Mines, Golden, Colorado 80401, United States
| | - Jae Kyoung Cho
- Department of Petroleum Engineering, Colorado School of Mines, Golden, Colorado 80401, United States
| | - Nils Tilton
- Department of Mechanical Engineering, Colorado School of Mines, Golden, Colorado 80401, United States
| | - Jaehun Chun
- Pacific Northwest National Laboratory, 902 Battelle Boulevard, Richland, Washington 99352, United States
| | - Wooyong Um
- Division of Advanced Nuclear Engineering, Pohang University of Science and Technology, Pohang-si, Gyeongbuk 790-784, Republic of Korea
| | - Xiaolong Yin
- Department of Petroleum Engineering, Colorado School of Mines, Golden, Colorado 80401, United States
| | - Keith B Neeves
- Departments of Bioengineering and Pediatrics, University of Colorado Denver Anschutz | Medical Campus, Aurora, Colorado 80045, United States
| | - Ning Wu
- Department of Chemical and Biological Engineering, Colorado School of Mines, Golden, Colorado 80401, United States
| |
Collapse
|
3
|
Li T, Shen C, Wu S, Jin C, Bradford SA. Synergies of surface roughness and hydration on colloid detachment in saturated porous media: Column and atomic force microscopy studies. WATER RESEARCH 2020; 183:116068. [PMID: 32619803 DOI: 10.1016/j.watres.2020.116068] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/24/2019] [Revised: 06/11/2020] [Accepted: 06/15/2020] [Indexed: 06/11/2023]
Abstract
Saturated column experiments were conducted to systematically examine the influence of hydration on the detachment of nano- and micro-sized latex colloids (35 nm and 1 μm, respectively) from sand. The colloids were attached on the sand in primary minima (PM) using high ionic strength (IS) NaCl solutions. The PM were predicted to be shallower and located farther from sand surfaces with increasing IS due to the hydration force. Consequently, a greater amount of colloid detachment occurred in deionized water when the colloids were initially deposited at a higher IS. Atomic force microscopy (AFM) examinations showed that both nanoscale protruding asperities and large wedge-like valleys existed on the sand surface. The influence of these surface features on the interaction energies/forces was modeled by approximating the roughness as cosinoidal waves and two intersecting half planes, respectively. The PM were deep and attachment was irreversible at concave regions for all ISs, even if the hydration force was included. Conversely, colloids were weakly attached at protruding asperities due to a reduced PM depth, and thus were responsible for the detachment upon IS reduction. The AFM examinations confirmed that the adhesive forces were enhanced and reduced (or even completely eliminated) at concave and convex locations of sand surfaces, respectively. These results have important implications for surface cleaning and prediction of the transport and fate of hazardous colloids and colloid-associated contaminants in subsurface environments.
Collapse
Affiliation(s)
- Tiantian Li
- Department of Soil and Water Sciences, China Agricultural University, Beijing, 100193, China
| | - Chongyang Shen
- Department of Soil and Water Sciences, China Agricultural University, Beijing, 100193, China.
| | - Sen Wu
- School of Precision Instruments and Optoelectronics Engineering, Tianjin University, Tianjin, 300072, China
| | - Chao Jin
- School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou, Guangdong, 510006, China
| | - Scott A Bradford
- USDA, ARS, U.S. Salinity Laboratory, Riverside, CA, 92507-4617, United States.
| |
Collapse
|
4
|
Wang Z, Li T, Shen C, Shang J, Shi K, Zhang Y, Li B. Humic acid induced weak attachment of fullerene nC 60 nanoparticles and subsequent detachment upon reduction of solution ionic strength in saturated porous media. JOURNAL OF CONTAMINANT HYDROLOGY 2020; 231:103630. [PMID: 32169749 DOI: 10.1016/j.jconhyd.2020.103630] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2019] [Revised: 01/04/2020] [Accepted: 02/20/2020] [Indexed: 06/10/2023]
Abstract
Sand column experiments were performed under saturated conditions to investigate impact of humic acid (HA) on attachment of nC60 nanoparticles (NPs) in NaCl and CaCl2 at ionic strengths (ISs) from 1 mM to 100 mM and subsequent detachment via reducing solution IS. The attachment increased with increasing IS due to reduced repulsive Derjaguin-Landau-Verwey-Overbeek (DLVO) interaction energy and accordingly increased retention in primary energy wells. More attachments occurred in CaCl2 compared to NaCl because Ca2+ exhibited greater charge screen ability and served as a bridging agent between the NPs and sand surfaces. The presence of HA significantly reduced nC60 NPs attachment on sand surfaces (especially on nanoscale physical heterogeneities) in 10 mM NaCl and 1 mM CaCl2 because of enhanced electrostatic and steric repulsions. Interestingly, although the HA did not cause reduction of attachment in 100 mM NaCl and 10 mM CaCl2 compared to the case in absence of HA, the HA caused weak attachment of nC60 on sand surfaces and then much more significant detachment by decreasing IS. The HA did not alter both attachment and detachment in 100 mM CaCl2, because the Ca2+ at the high concentration caused formation of very stable complex of HA and NPs, and strong interaction of the complex with the sand surfaces via cation bridge. Our study highlighted that the HA can not only enhance the transport of NPs by inhibiting attachment as revealed in the literature, but also by the continuous capture and release of the NPs from surfaces in subsurface environments.
Collapse
Affiliation(s)
- Zhan Wang
- Department of Soil and Water Sciences, China Agricultural University, Beijing 100193, China.; College of Land and Environment, Shenyang Agricultural University, Shenyang, Liaoning 110866, China
| | - Tiantian Li
- Department of Soil and Water Sciences, China Agricultural University, Beijing 100193, China
| | - Chongyang Shen
- Department of Soil and Water Sciences, China Agricultural University, Beijing 100193, China..
| | - Jianying Shang
- Department of Soil and Water Sciences, China Agricultural University, Beijing 100193, China
| | - Kaiyu Shi
- Department of Soil and Water Sciences, China Agricultural University, Beijing 100193, China
| | - Yulong Zhang
- College of Land and Environment, Shenyang Agricultural University, Shenyang, Liaoning 110866, China
| | - Baoguo Li
- Department of Soil and Water Sciences, China Agricultural University, Beijing 100193, China..
| |
Collapse
|
5
|
Abstract
![]()
Diamond is a highly
attractive coating material as it is characterized
by a wide optical transparency window, a high thermal conductivity,
and an extraordinary robustness due to its mechanical properties and
its chemical inertness. In particular, the latter has aroused a great
deal of interest for scanning probe microscopy applications in recent
years. In this study, we present a novel method for the fabrication
of atomic force microscopy (AFM) probes for force spectroscopy using
robust diamond-coated spheres, i.e., colloidal particles. The so-called
colloidal probe technique is commonly used to study interactions of
single colloidal particles, e.g., on biological samples like living
cells, or to measure mechanical properties like the Young’s
modulus. Under physiological measurement conditions, contamination
of the particle often strongly limits the measurement time and often
impedes reusability of the probe. Diamond as a chemically inert material
allows treatment with harsh chemicals without degradation to refurbish
the probe. Apart from that, the large surface area of spherical probes
makes sensitive studies on surface interactions possible. This provides
detailed insight into the interface of diamond with other materials
and/or solvents. To fabricate such probes, silica microspheres were
coated with a nanocrystalline diamond film and attached to tipless
cantilevers. Measurements on soft polydimethylsiloxane (PDMS) show
that the manufactured diamond spheres, even though possessing a rough
surface, can be used to determine the Young’s modulus from
a Derjaguin-Muller-Toporov (DMT) fit. By means of force spectroscopy,
they can readily probe force interactions of diamond with different
substrate materials under varying conditions. The influence of the
surface termination of the diamond was investigated concerning the
interaction with flat diamond substrates in air. Additionally, measurements
in solution, using varying salt concentrations, were carried out,
which provide information on double-layer and van-der-Waals forces
at the interface. The developed technique offers detailed insight
into surface chemistry and physics of diamond with other materials
concerning long and short-range force interactions and may provide
a valuable probe for investigations under harsh conditions but also
on biological samples, e.g., living cells, due to the robustness,
chemical inertness, and biocompatibility of diamond.
Collapse
Affiliation(s)
- Peter Knittel
- Fraunhofer IAF , Institute for Applied Solid State Physics , Tullastraße 72 , 79108 Freiburg , Germany
| | - Taro Yoshikawa
- Fraunhofer IAF , Institute for Applied Solid State Physics , Tullastraße 72 , 79108 Freiburg , Germany
| | - Christoph E Nebel
- Fraunhofer IAF , Institute for Applied Solid State Physics , Tullastraße 72 , 79108 Freiburg , Germany
| |
Collapse
|
6
|
Mallikarjunachari G, Nallamilli T, Ravindran P, Basavaraj MG. Nanoindentation of clay colloidosomes. Colloids Surf A Physicochem Eng Asp 2018. [DOI: 10.1016/j.colsurfa.2018.04.041] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
7
|
Hamon JJ, Tabor RF, Striolo A, Grady BP. Atomic Force Microscopy Force Mapping Analysis of an Adsorbed Surfactant above and below the Critical Micelle Concentration. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:7223-7239. [PMID: 29807434 DOI: 10.1021/acs.langmuir.8b00574] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Force curves collected using an atomic force microscope (AFM) in the presence of adsorbed surfactants are often used to draw conclusions about adsorbed film packing, rigidity, and thickness. However, some noteworthy features of such force curve characteristics have yet to be thoroughly investigated and explained. In this work, we collected force curves from tetradecyltrimethylammonium bromide films adsorbed on highly oriented pyrolytic graphite (HOPG), silica, and silica that had been hydrophobized by functionalization with dichlorodimethyl silane. Breakthrough events in the force curves from several different trials were compared to show that the breakthrough distance, often reported as the adsorbed film thickness, increased with concentration below the critical micelle concentration (CMC) but was approximately 3.5 nm on all surfaces between 2× and 10× CMC; an unexpected result because of the different surface chemistries for the three surfaces. We employed an AFM probe with a different force constant ( k) value as well as a colloidal probe and the breakthrough distance remained approximately 3.5 nm in all cases. Gradient mapping, a variant of force mapping, was also implemented on the three surfaces and resulted in a new technique for visualizing adsorbed surfactant in situ. The resulting maps showed patches of adsorbed surfactant below the CMC and revealed that with increasing concentration, the size of the patches increased resulting in full coverage near and above the CMC. These results are, to our knowledge, the first time force mapping has been used to spatially track patches of adsorbed surfactant. Finally, layers of surfactants on an AFM tip were investigated by collecting a force map on a single AFM tip using the tip of a separate AFM probe. A breakthrough event was observed between the tips, indicating that a layer of surfactant was present on at least one, if not both tips.
Collapse
Affiliation(s)
- J J Hamon
- School of Chemical, Biological and Materials Engineering and Institute of Applied Surfactant Research , University of Oklahoma , Norman , Oklahoma 73019 , United States
| | - Rico F Tabor
- School of Chemistry , Monash University , Wellington Road , Clayton , Victoria 3800 , Australia
| | - Alberto Striolo
- Department of Chemical Engineering , University College London , London WC1E 7JE , U.K
| | - Brian P Grady
- School of Chemical, Biological and Materials Engineering and Institute of Applied Surfactant Research , University of Oklahoma , Norman , Oklahoma 73019 , United States
| |
Collapse
|
8
|
Abstract
Contemporary chemical and material engineering often takes inspiration from nature, targeting for example strong yet light materials and materials composed of highly ordered domains at multiple different lengthscales for fundamental science and applications in e.g. sensing, catalysis, coating technology, and delivery. The preparation of such hierarchically structured functional materials through guided bottom-up assembly of synthetic building blocks requires a high level of control over their synthesis, interactions and assembly pathways. In this perspective we showcase recent work demonstrating how molecular control can be exploited to direct colloidal assembly into responsive materials with mechanical, optical or electrical properties that can be adjusted post-synthesis with external cues.
Collapse
Affiliation(s)
- M Gerth
- Laboratory of Physical Chemistry, and Institute of Complex Molecular Systems, Eindhoven University of Technology, P.O. Box 513, 5600 MD, Eindhoven, The Netherlands
| | | |
Collapse
|
9
|
Guo S, Pranantyo D, Kang ET, Loh XJ, Zhu X, Jańczewski D, Neoh KG. Dominant Albumin-Surface Interactions under Independent Control of Surface Charge and Wettability. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:1953-1966. [PMID: 29319318 DOI: 10.1021/acs.langmuir.7b04117] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Understanding protein adsorption behaviors on solid surfaces constitutes an important step toward development of efficacious and biocompatible medical devices. Both surface charge and wettability have been shown to influence protein adsorption attributes, including kinetics, quantities, deformation, and reversibility. However, determining the dominant interaction in these surface-induced phenomena is challenging because of the complexity of inter-related mechanisms at the liquid/solid interface. Herein, we reveal the dominant interfacial forces in these essential protein adsorption attributes under the influence of a combination of surface charge and wettability, using quartz crystal microbalance with dissipation monitoring and atomic force microscopy-based force spectroscopy on a series of model surfaces. These surfaces were fabricated via layer-by-layer assembly, which allowed two-dimensional control of surface charge and wettability with minimal cross-parameter dependency. We focused on a soft globular protein, bovine serum albumin (BSA), which is prone to conformational changes during adsorption. The information obtained from the two techniques shows that both surface charge and hydrophobicity can increase the protein-surface interaction forces and the adsorbed amount. However, surface hydrophobicity triggered a greater extent of deformation in the adsorbed BSA molecules, leading to more dehydration, spreading, and resistance to elution by ionic strength changes regardless of the surface charge. The role played by the surface charge in the adsorbed protein conformation and extent of desorption induced by changes in the ionic strength is secondary to that of surface hydrophobicity. These findings advance the understanding of how surface chemistry and properties can be tailored for directing protein-substrate interactions.
Collapse
Affiliation(s)
- Shanshan Guo
- NUS Graduate School for Integrative Science and Engineering, National University of Singapore , Kent Ridge, 117576, Singapore
| | - Dicky Pranantyo
- Department of Chemical and Biomolecular Engineering, National University of Singapore , 4 Engineering Drive 4, 119260, Singapore
| | - En-Tang Kang
- Department of Chemical and Biomolecular Engineering, National University of Singapore , 4 Engineering Drive 4, 119260, Singapore
| | - Xian Jun Loh
- Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research) , 2 Fusionopolis Way, 138634, Singapore
- Department of Materials Science and Engineering, National University of Singapore , 9 Engineering Drive 1, 117576, Singapore
- Singapore Eye Research Institute , 11 Third Hospital Avenue, 168751, Singapore
| | - Xiaoying Zhu
- Department of Environmental Science, Zhejiang University , Hangzhou 310058, China
| | - Dominik Jańczewski
- Laboratory of Technological Processes, Faculty of Chemistry, Warsaw University of Technology , Noakowskiego 3, 00-664 Warsaw, Poland
| | - Koon Gee Neoh
- NUS Graduate School for Integrative Science and Engineering, National University of Singapore , Kent Ridge, 117576, Singapore
- Department of Chemical and Biomolecular Engineering, National University of Singapore , 4 Engineering Drive 4, 119260, Singapore
| |
Collapse
|
10
|
Comparison of silicon and OH-modified AFM tips for adhesion force analysis on functionalised surfaces and natural polymers. Colloids Surf A Physicochem Eng Asp 2017. [DOI: 10.1016/j.colsurfa.2017.06.017] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
11
|
Jin C, Zhao W, Normani SD, Zhao P, Emelko MB. Synergies of media surface roughness and ionic strength on particle deposition during filtration. WATER RESEARCH 2017; 114:286-295. [PMID: 28254646 DOI: 10.1016/j.watres.2017.02.010] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/25/2016] [Revised: 02/04/2017] [Accepted: 02/06/2017] [Indexed: 06/06/2023]
Abstract
Although it is widely believed that media/collector roughness can enhance particle deposition on surfaces, this effect has not been consistently observed nor systematically described. Here, column tests were conducted to: 1) evaluate media roughness impacts on particle deposition in the presence of an energy barrier (i.e., at low ionic strength conditions), and 2) describe the concurrent impacts of collector surface roughness and suspension fluid ionic strength on particle deposition in packed beds. This work presents a first, systematic demonstration that media/collector surface roughness consistently influences particle deposition in a non-linear, non-monotonic manner, irrespective of the presence of an energy barrier. Notably, ionic strength-associated changes in DLVO interaction energy could not solely explain observed differences in particle deposition associated with collector surface roughness. Particle-to-roughness element and particle-to-smooth/bottom surface interactions contributed to a critical roughness size associated with a minimum DLVO interaction energy; however, that critical size is not necessarily the same as the critical size associated with minimal particle deposition rates. Surface roughness and ionic strength concurrently affected particle deposition in a manner that is not simply additive; rather, particle deposition rates were highly correlated with inverse Debye-Hückel length (i.e., ln [κ-1]) using second-order polynomial functions. Notably, the secondary energy minimum alone appears inadequate for explaining the observed particle deposition behavior. These relationships may provide insight for further development of physico-chemical filtration models for describing particle deposition on surfaces.
Collapse
Affiliation(s)
- Chao Jin
- Department of Civil and Environmental Engineering, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada; Department of Systems Design Engineering, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
| | - Weigao Zhao
- Department of Environmental Engineering, School of Environmental Science and Engineering, Tianjin University, Tianjin 300072, China
| | - Stefano D Normani
- Department of Civil and Environmental Engineering, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
| | - Peng Zhao
- Department of Environmental Engineering, School of Environmental Science and Engineering, Tianjin University, Tianjin 300072, China
| | - Monica B Emelko
- Department of Civil and Environmental Engineering, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada; Department of Systems Design Engineering, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada.
| |
Collapse
|
12
|
Zhang P, Yang L, Li Q, Wu S, Jia S, Li Z, Zhang Z, Shi L. Ellipsoidal Colloids with a Controlled Surface Roughness via Bioinspired Surface Engineering: Building Blocks for Liquid Marbles and Superhydrophobic Surfaces. ACS APPLIED MATERIALS & INTERFACES 2017; 9:7648-7657. [PMID: 28181430 DOI: 10.1021/acsami.6b16733] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Understanding the important role of the surface roughness of nano/colloidal particles and harnessing them for practical applications need novel strategies to control the particles' surface topology. Although there are many examples of spherical particles with a specific surface roughness, nonspherical ones with similar surface features are rare. The current work reports a one-step, straightforward, and bioinspired surface engineering strategy to prepare ellipsoidal particles with a controlled surface roughness. By manipulating the unique chemistry inherent to the oxidation-induced self-polymerization of dopamine into polydopamine (PDA), PDA coating of polymeric ellipsoids leads to a library of hybrid ellipsoidal particles (PS@PDA) with a surface that decorates with nanoscale PDA protrusions of various densities and sizes. Together with the advantages originated from the anisotropy of ellipsoids and rich chemistry of PDA, such a surface feature endows these particles with some unique properties. Evaporative drying of fluorinated PS@PDA particles produces a homogeneous coating with superhydrophobicity that arises from the two-scale hierarchal structure of microscale interparticle packing and nanoscale roughness of the constituent ellipsoids. Instead of water repelling that occurs for most of the lotus leaf-like superhydrophobic surfaces, such coating exhibits strong water adhesion that is observed with certain species of rose pedals. In addition, the as-prepared hybrid ellipsoids are very efficient in preparing liquid marble-isolated droplets covered with solid particles. Such liquid marbles can be placed onto many surfaces and might be useful for the controllable transport and manipulation of small volumes of liquids.
Collapse
Affiliation(s)
- Pengjiao Zhang
- Key Laboratory of Functional Polymer Materials of Ministry of Education, Institute of Polymer Chemistry, College of Chemistry, Nankai University , Tianjin 300071, China
| | - Lu Yang
- School of Chemical Engineering and Technology, Tianjin University , Tianjin 300072, China
| | - Qiang Li
- Key Laboratory of Functional Polymer Materials of Ministry of Education, Institute of Polymer Chemistry, College of Chemistry, Nankai University , Tianjin 300071, China
| | - Songhai Wu
- School of Chemical Engineering and Technology, Tianjin University , Tianjin 300072, China
| | - Shaoyi Jia
- School of Chemical Engineering and Technology, Tianjin University , Tianjin 300072, China
| | - Zhanyong Li
- Key Laboratory of Functional Polymer Materials of Ministry of Education, Institute of Polymer Chemistry, College of Chemistry, Nankai University , Tianjin 300071, China
| | - Zhenkun Zhang
- Key Laboratory of Functional Polymer Materials of Ministry of Education, Institute of Polymer Chemistry, College of Chemistry, Nankai University , Tianjin 300071, China
| | - Linqi Shi
- Key Laboratory of Functional Polymer Materials of Ministry of Education, Institute of Polymer Chemistry, College of Chemistry, Nankai University , Tianjin 300071, China
| |
Collapse
|
13
|
Jin C, Ren CL, Emelko MB. Concurrent Modeling of Hydrodynamics and Interaction Forces Improves Particle Deposition Predictions. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2016; 50:4401-4412. [PMID: 27007293 DOI: 10.1021/acs.est.6b00218] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
It is widely believed that media surface roughness enhances particle deposition-numerous, but inconsistent, examples of this effect have been reported. Here, a new mathematical framework describing the effects of hydrodynamics and interaction forces on particle deposition on rough spherical collectors in absence of an energy barrier was developed and validated. In addition to quantifying DLVO force, the model includes improved descriptions of flow field profiles and hydrodynamic retardation functions. This work demonstrates that hydrodynamic effects can significantly alter particle deposition relative to expectations when only the DLVO force is considered. Moreover, the combined effects of hydrodynamics and interaction forces on particle deposition on rough, spherical media are not additive, but synergistic. Notably, the developed model's particle deposition predictions are in closer agreement with experimental observations than those from current models, demonstrating the importance of inclusion of roughness impacts in particle deposition description/simulation. Consideration of hydrodynamic contributions to particle deposition may help to explain discrepancies between model-based expectations and experimental outcomes and improve descriptions of particle deposition during physicochemical filtration in systems with nonsmooth collector surfaces.
Collapse
Affiliation(s)
- Chao Jin
- Department of Civil and Environmental Engineering, University of Waterloo , 200 University Ave W., Waterloo, Ontario N2L 3G1, Canada
| | - Carolyn L Ren
- Department of Mechanical and Mechatronics Engineering, University of Waterloo , 200 University Ave W., Waterloo, Ontario N2L 3G1, Canada
| | - Monica B Emelko
- Department of Civil and Environmental Engineering, University of Waterloo , 200 University Ave W., Waterloo, Ontario N2L 3G1, Canada
| |
Collapse
|